Cutout: Fix issues with PopupWindows

Fixes a problem where popup windows were treated as fullscreen to avoid
the cutout, messing up the positioning relative to their parent. Fixed
by treating popups that lay out within the frame of their parent as already
avoiding the cutout.

Change-Id: Ia7365c7836c28ea956b6236a005e426b634df8ca
Fixes: 72965959
Test: Open Gmail, compose new message, autocomplete dialog is properly aligned
Test: Select text, selection handles are properly aligned
Test: Select text, copy/past popup is properly aligned